Re: [idvusers] Maximum Heap Size

Kevin. Jeff,

that new caching facility does sound promising!

As far as i know JAVA Heap spaces can grow unlimited on (OPen) Solaris  
systems, and probably also on Linux 64-bit with JAVA 64-bit but maybe  
someone else would be able to tell you...

Here are some of our experiences assigning space heap sizes all running  
IDV from a Java webstart jnlp:

-Linux 64-bit takes you up to 3.5 Gb
-Windows 32-bit varies (depending on what dll's are loaded at which  
memory address) roughly 1.5 Gb

see some of the jnlp's at http://adde.itc.nl at the "Download" section.

We'll have to wait for Dolphin JAVA virtual machine for large memory  
addressing to make it into JAVA webstart which by then will also support  
all the 64-bit goodies.

Jeff, would you be able to tell if a 64-bit version of java3d is in the  
making or will these two  (32-bit java3d & 64-bit jvm) co-exist happily  
together?

Kind regards, 
Valentijn 
V. Venus, M.Sc. 
Researcher/Lecturer in RS/GIS for Food Security 
ITC
P.O.Box 6
7500 AA Enschede
The Netherlands
Tel: +31-53-4874549
Fax:+31-53-4874388 


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-----Original Message-----
From: idvusers-bounces@xxxxxxxxxxxxxxxx on behalf of Jeff McWhirter
Sent: Wed 10/3/2007 23:18
To: Kevin L. Manross
Cc: IDV Users
Subject: Re: [idvusers] Maximum Heap Size
 

Hi Kevin,
I'm sure some folks will chime in with their experience with max memory 
size.
>
> Specifically, I'm wanting to display relatively long animations of data 
> displaying isosurfaces.
>   

We have recently  added a facility to cache the data to a local disk 
store. If you are running a recent build - for grids if you go to the 
properties dialog of the data source there is a "Always cache to disk" 
checkbox. Turning that on will result in the IDV reading in the data 
timestep by timestep right when each timestep is accessed, e.g., when 
the display is rendered. Once we read it we write it to disk and get rid 
of it from memory. Then, when the data is accessed again (say, when the 
display is re-rendered or the data is probed) we read it back from the 
local disk.

The "Delay" field is how long the IDV waits until it gets rid of the 
data from memory. For example, if you are probing the data you might 
want to increase the delay so the IDV doesn't keep going to disk every 
time the probe moves.

This is a user option because you do take a performance hit in the IO to 
local disk. But, it will dramatically reduce memory usage.

A caveat - this is fairly new the past 6 weeks or so but it seems to be 
working pretty well.

-Jeff

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